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Ni X, Wang J, Tian Y, Ke H, Liao Y, Lv Y. Analysis of vasoactive and oxidative stress indicators for evaluating the efficacy of continuous positive airway pressure, and relation of vasoactive and oxidative stress indicators and cardiac function in obstructive sleep Apnea Syndrome patients. J Med Biochem 2024; 43:200-208. [PMID: 38699699 PMCID: PMC11062342 DOI: 10.5937/jomb0-42944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 06/15/2023] [Indexed: 05/05/2024] Open
Abstract
Background Obstructive Sleep Apnea Syndrome (OSAS) is a breathing disorder during sleep. The work was to evaluate the relationship between vasoactive and oxidative stress indicators and cardiac function in Obstructive Sleep Apnea Syndrome (OSAS) patients. Methods OSAS patients (n=120) were treated with CPAP from May 2021 to June 2022. According to the clinical efficacy, the patients were divided into effective and ineffective groups. Vasoactive factors and oxidative stress indices were compared between the two groups to evaluate their clinical efficacy. The changes in cardiac function indices in the two groups were tested, and the correlation between vasoactive factors and oxidative stress indices and cardiac function was analysed. Results The effective rate of CPAP was 63.33% (76/120). Ang II, ET-1, and MDA levels were lower, and the SOD level was higher in the effective group than in the ineffective group after treatment. The AUC of the four indicators was all greater than 0.75. LPWT and IVST values of the effective group were lower than the ineffective group. A positive correlation was identified between the levels of Ang II, ET-1, and MDA with LPWT, between levels of ET-1 and MDA with IVST, and a negative correlation between SOD with LPWT and IVST. Conclusions CPAP treatment can effectively improve vascular activity and reduce the oxidative stress response in OSAS patients, and the combined detection of vasoactive factors and oxidative stress indicators is valuable for evaluating the efficacy of CPAP and is related to the cardiac function of patients.
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Affiliation(s)
- Xiaohong Ni
- Huanggang Central Hospital, Department of Neurology, Huanggang City, China
| | - Jinhua Wang
- Huanggang Central Hospital, Department of Neurology, Huanggang City, China
| | - Yu Tian
- Huanggang Central Hospital, Department of Neurology, Huanggang City, China
| | - Hongyan Ke
- Huanggang Central Hospital, Department of Neurology, Huanggang City, China
| | - Yuangao Liao
- Huanggang Central Hospital, Department of Neurology, Huanggang City, China
| | - Yanwen Lv
- Huanggang Central Hospital, Department of Neurology, Huanggang City, China
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Simões RP, Goulart CDL, Caruso FR, de Araújo ASG, de Moura SCG, Catai AM, Dos Santos PB, Camargo PDF, Marinho RS, Mendes RG, Borghi-Silva A. Non-invasive ventilatory support accelerates the oxygen uptake and heart rate kinetics and improves muscle oxygenation dynamics in COPD-HF patients. Am J Med Sci 2023:S0002-9629(23)01177-1. [PMID: 37156461 DOI: 10.1016/j.amjms.2023.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 03/23/2023] [Accepted: 05/03/2023] [Indexed: 05/10/2023]
Abstract
BACKGROUND The aim of this study was to explore the effects of non-invasive positive pressure ventilation (NIPPV) associated with high-intensity exercise on heart rate (HR) and oxygen uptake (V̇O2) recovery kinetics in in patients with coexistence of chronic obstructive pulmonary disease (COPD) and heart failure (HF). METHODS This is a randomized, double blinded, sham-controlled study involving 14 HF-COPD patients, who underwent a lung function test and Doppler echocardiography. On two different days, patients performed incremental cardiopulmonary exercise testing (CPET) and two constant-work rate tests (80% of CPET peak) receiving Sham or NIPPV (bilevel mode - Astral 150) in a random order until the limit of tolerance (Tlim). During exercise, oxyhemoglobin and deoxyhemoglobin were assessed using near-infrared spectroscopy (Oxymon, Artinis Medical Systems, Einsteinweg, Netherland). RESULTS The kinetic variables of both V̇O2 and HR during the high-intensity constant workload protocol were significantly faster in the NIPPV protocol compared to Sham ventilation (P<0.05). Also, there was a marked improvement in oxygenation and lower deoxygenation of both peripheral and respiratory musculature in TLim during NIPPV when contrasted with Sham ventilation. CONCLUSIONS NIPPV applied during high-intensity dynamic exercise can effectively improve exercise tolerance, accelerate HR and V̇O2 kinetics, improve respiratory and peripheral muscle oxygenation in COPD-HF patients. These beneficial results from the effects of NIPPV may provide evidence and a basis for high-intensity physical training for these patients in cardiopulmonary rehabilitation programs.
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Affiliation(s)
- Rodrigo Polaquini Simões
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Cássia da Luz Goulart
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Flávia Rossi Caruso
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Adriana S Garcia de Araújo
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Sílvia Cristina Garcia de Moura
- Cardiovascular Physical Therapy Laboratory, Physiotherapy Department, Federal University of São Carlos, Rod Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Aparecida Maria Catai
- Cardiovascular Physical Therapy Laboratory, Physiotherapy Department, Federal University of São Carlos, Rod Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Polliana Batista Dos Santos
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Patricia de Faria Camargo
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Renan Shida Marinho
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Renata Gonçalves Mendes
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil
| | - Audrey Borghi-Silva
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, UFSCar, Rodovia Washington Luis, KM 235, Monjolinho, Sao Carlos, SP, Brazil.
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Ma Y, Chang MC, Litrownik D, Wayne PM, Yeh GY. Day-night patterns in heart rate variability and complexity: differences with age and cardiopulmonary disease. J Clin Sleep Med 2023; 19:873-882. [PMID: 36692177 PMCID: PMC10152358 DOI: 10.5664/jcsm.10434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 12/05/2022] [Accepted: 12/05/2022] [Indexed: 01/25/2023]
Abstract
STUDY OBJECTIVES Heart rate variability (HRV) measures provide valuable insights into physiology; however, gaps remain in understanding circadian patterns in heart rate dynamics. We aimed to explore day-night differences in heart rate dynamics in patients with chronic cardiopulmonary disease compared with healthy controls. METHODS Using 24-hour heart rate data from patients with chronic obstructive pulmonary disease (COPD) and/or heart failure (n = 16) and healthy adult controls (older group: ≥50 years, n = 42; younger group: 20-49 years, n = 136), we compared day-night differences in conventional time and frequency domain HRV indices and a multiscale-entropy-based complexity index (CI1-20) of HRV among the 3 groups. RESULTS Twenty-four-hour HRV showed significant day-night differences (marked with "△") among younger healthy (mean age: 34.5 years), older healthy (mean age: 61.6 years), and cardiopulmonary patients (mean age: 68.4 years), including change in percentage of adjacent intervals that differ > 50 ms (△pNN50), high frequency (△HF), normalized low frequency (△nLF), ratio (△LF/HF), and △CI1-20. Among these, △LF/HF (2.13 ± 2.35 vs 1.1 ± 2.47 vs -0.35 ± 1.25; P < .001) and △CI1-20 (0.15 ± 0.24 vs 0.02 ± 0.28 vs -0.21 ± 0.27; P < .001) were significant in each pairwise comparison following analysis of variance tests. Average CI1-20 was highest in younger healthy individuals and lowest in cardiopulmonary patients (1.37 ± 0.12 vs 1.01 ± 0.27; P < .001). Younger healthy patients showed a heart rate complexity dipping pattern (night < day), older healthy patients showed nondipping, and cardiopulmonary patients showed reverse dipping (night > day). CONCLUSIONS As measures of 24-hour variability, traditional and complexity-based metrics of HRV exhibit large day-night differences in healthy individuals; these differences are blunted, or even reversed, in individuals with cardiopulmonary pathology. Measures of diurnal dynamics may be useful indices of reduced adaptive capacity in patients with cardiopulmonary conditions. CITATION Ma Y, Chang M-C, Litrownik D, Wayne PM, Yeh GY. Day-night patterns in heart rate variability and complexity: differences with age and cardiopulmonary disease. J Clin Sleep Med. 2023;19(5):873-882.
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Affiliation(s)
- Yan Ma
- Osher Center for Integrative Medicine, Division of Preventive Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
| | - Mei-Chu Chang
- Division of Interdisciplinary Medicine and Biotechnology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - Daniel Litrownik
- Osher Center for Integrative Medicine, Division of Preventive Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
- Division of General Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - Peter M. Wayne
- Osher Center for Integrative Medicine, Division of Preventive Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
| | - Gloria Y. Yeh
- Osher Center for Integrative Medicine, Division of Preventive Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
- Division of General Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
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Camargo PF, Ditomaso-Luporini L, de Carvalho LCS, Goulart CDL, Batista Dos Santos P, Sebold R, Roscani MG, Mendes RG, Borghi-Silva A. Obstructive sleep apnea reduces functional capacity and impairs cardiac autonomic modulation during submaximal exercise in patients with chronic obstructive pulmonary disease: A follow-up study. Heart Lung 2023; 57:257-264. [PMID: 36332349 DOI: 10.1016/j.hrtlng.2022.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 10/13/2022] [Accepted: 10/16/2022] [Indexed: 11/06/2022]
Abstract
BACKGROUND Functional capacity and heart rate variability (HRV) are important prognostic markers in chronic obstructive pulmonary disease (COPD) and obstructive sleep apnea syndrome (OSA). However, the impact of the overlap of these diseases and the one-year clinical follow-up has not yet been evaluated. OBJECTIVES To assess whether the presence of OSA can impair functional performance and cardiac autonomic control during exercise in patients with COPD; and to verify whether the overlap of these diseases could lead to worse clinical outcomes during the one-year follow-up. METHODS Thirty-four patients underwent pulmonary function tests, echocardiography and polysomnography for diagnostic confirmation, disease staging, exclusion of any cardiac changes, and allocation between groups. The patients underwent the six-minute walk test (6MWT) to assess functional capacity and HRV during exercise. Subsequently, patients were followed up for 12 months to record outcomes such as exacerbation, hospitalization, and deaths. At the end of this period, the patients were revaluated to verify the hypotheses of the study. RESULTS The OSA-COPD group showed greater functional impairment when compared to the COPD group (p=0.003) and showed worse cardiac autonomic responses during the 6MWT with greater parasympathetic activation (p=0.03) and less complexity of the autonomic nervous system, in addition to being more likely to exacerbate (p=0.03) during one year of follow-up. CONCLUSION OSA-COPD produces deleterious effects on functional performance and a greater autonomic imbalance that impairs clinical outcomes.
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Affiliation(s)
- Patrícia Faria Camargo
- Cardiopulmonary Physiotherapy Laboratory, Department of Physical Therapy, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil
| | - Luciana Ditomaso-Luporini
- Cardiopulmonary Physiotherapy Laboratory, Department of Physical Therapy, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil
| | - Luiz Carlos Soares de Carvalho
- Center for Science and Technology in Energy and Sustainability of Federal University of Reconcavo da Bahia, Feira de Santana, Bahia, Brazil
| | - Cássia da Luz Goulart
- Cardiopulmonary Physiotherapy Laboratory, Department of Physical Therapy, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil
| | - Polliana Batista Dos Santos
- Cardiopulmonary Physiotherapy Laboratory, Department of Physical Therapy, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil
| | - Rayane Sebold
- Cardiopulmonary Physiotherapy Laboratory, Department of Physical Therapy, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil
| | - Meliza Goi Roscani
- Medicine Department, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil
| | - Renata Gonçalves Mendes
- Cardiopulmonary Physiotherapy Laboratory, Department of Physical Therapy, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil
| | - Audrey Borghi-Silva
- Cardiopulmonary Physiotherapy Laboratory, Department of Physical Therapy, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil.
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Spiesshoefer J, Regmi B, Ottaviani MM, Kahles F, Giannoni A, Borrelli C, Passino C, Macefield V, Dreher M. Sympathetic and Vagal Nerve Activity in COPD: Pathophysiology, Presumed Determinants and Underappreciated Therapeutic Potential. Front Physiol 2022; 13:919422. [PMID: 35845993 PMCID: PMC9281604 DOI: 10.3389/fphys.2022.919422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 06/02/2022] [Indexed: 11/13/2022] Open
Abstract
This article explains the comprehensive state of the art assessment of sympathetic (SNA) and vagal nerve activity recordings in humans and highlights the precise mechanisms mediating increased SNA and its corresponding presumed clinical determinants and therapeutic potential in the context of chronic obstructive pulmonary disease (COPD). It is known that patients with COPD exhibit increased muscle sympathetic nerve activity (MSNA), as measured directly using intraneural microelectrodes—the gold standard for evaluation of sympathetic outflow. However, the underlying physiological mechanisms responsible for the sympathoexcitation in COPD and its clinical relevance are less well understood. This may be related to the absence of a systematic approach to measure the increase in sympathetic activity and the lack of a comprehensive approach to assess the underlying mechanisms by which MSNA increases. The nature of sympathoexcitation can be dissected by distinguishing the heart rate increasing properties (heart rate and blood pressure variability) from the vasoconstrictive drive to the peripheral vasculature (measurement of catecholamines and MSNA) (Graphical Abstract Figure 1). Invasive assessment of MSNA to the point of single unit recordings with analysis of single postganglionic sympathetic firing, and hence SNA drive to the peripheral vasculature, is the gold standard for quantification of SNA in humans but is only available in a few centres worldwide because it is costly, time consuming and requires a high level of training. A broad picture of the underlying pathophysiological determinants of the increase in sympathetic outflow in COPD can only be determined if a combination of these tools are used. Various factors potentially determine SNA in COPD (Graphical Abstract Figure 1): Obstructive sleep apnoea (OSA) is highly prevalent in COPD, and leads to repeated bouts of upper airway obstructions with hypoxemia, causing repetitive arousals. This probably produces ongoing sympathoexcitation in the awake state, likely in the “blue bloater” phenotype, resulting in persistent vasoconstriction. Other variables likely describe a subset of COPD patients with increase of sympathetic drive to the heart, clinically likely in the “pink puffer” phenotype. Pharmacological treatment options of increased SNA in COPD could comprise beta blocker therapy. However, as opposed to systolic heart failure a similar beneficial effect of beta blocker therapy in COPD patients has not been shown. The point is made that although MSNA is undoubtedly increased in COPD (probably independently from concomitant cardiovascular disease), studies designed to determine clinical improvements during specific treatment will only be successful if they include adequate patient selection and translational state of the art assessment of SNA. This would ideally include intraneural recordings of MSNA and—as a future perspective—vagal nerve activity all of which should ideally be assessed both in the upright and in the supine position to also determine baroreflex function.
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Affiliation(s)
- Jens Spiesshoefer
- Department of Pneumology and Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
- Institute of Life Sciences, Scuola Superiore Sant’Anna, Pisa, Italy
- *Correspondence: Jens Spiesshoefer, , orcid.org/0000-0001-8205-1749
| | - Binaya Regmi
- Department of Pneumology and Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | | | - Florian Kahles
- Department of Cardiology and Vascular Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | - Alberto Giannoni
- Institute of Life Sciences, Scuola Superiore Sant’Anna, Pisa, Italy
| | - Chiara Borrelli
- Institute of Life Sciences, Scuola Superiore Sant’Anna, Pisa, Italy
| | - Claudio Passino
- Institute of Life Sciences, Scuola Superiore Sant’Anna, Pisa, Italy
| | - Vaughan Macefield
- Human Autonomic Neurophysiology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Department of Anatomy and Physiology, University of Melbourne, Melbourne, VIC, Australia
| | - Michael Dreher
- Department of Pneumology and Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
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Lurie A, Roche N. Obstructive Sleep Apnea in Patients with Chronic Obstructive Pulmonary Disease: Facts and Perspectives. COPD 2021; 18:700-712. [PMID: 34595967 DOI: 10.1080/15412555.2021.1950663] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The co-occurrence of obstructive sleep apnea (OSA) and chronic obstructive pulmonary disease (COPD) in the same patient, named the overlap syndrome (OS), was first described in 1985. Although the American Thoracic Society underlined the limited knowledge of OS, stated research priorities for this condition, and recommended a "screening" strategy to identify OSA in COPD patients with chronic stable hypercapnia, research studies on OS remain scarce. This review aims to summarize the current knowledge and perspectives related to OSA in COPD patients. OS prevalence is 1.0-3.6% in the general population, 3-66% in COPD patients, and 7-55% in OSA patients. OS patients may have worse sleep quality than those with OSA or COPD alone. Scoring hypopneas may be difficult in COPD patients; desaturation episodes may have origins in these patients, namely upper airway obstruction, hypoventilation during paradoxical sleep, ventilation/perfusion mismatches, and obesity. The apnea-hypopnea index is similar in OSA and OS patients. Desaturations may be greater and more prolonged in OS patients than in patients with COPD or OSA alone. Low body mass index, hyperinflation, and less collapsible airways reduce the risk of OSA in COPD patients. OSA is a risk factor for pulmonary hypertension in COPD patients. Whether OS increases mortality and morbidity risks compared to COPD or OSA alone remains to be confirmed. No guidelines currently recommend specific approaches to the treatment of OSA in patients with COPD.
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Affiliation(s)
- Alain Lurie
- Clinique Ambroise Paré, Laboratoire du sommeil, Neuilly-sur-Seine, France.,Hôpital Cochin (AP-HP Centre), Pneumologie, Paris, France
| | - Nicolas Roche
- Hôpital Cochin (AP-HP Centre), Pneumologie, Université de Paris (Descartes), UMR 1016, Institut Cochin, Paris, France
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Mostarda C, Barboza CDA, Cutrim AL, Silva-Filho AC, Dias CJ, Brito-Monzani JDO, Rodrigues B. Obesity as an additional factor for autonomic imbalance and poor sleep behavior in chronic obstructive pulmonary disease: a case-control study. Clinics (Sao Paulo) 2021; 76:e1826. [PMID: 33503172 PMCID: PMC7798128 DOI: 10.6061/clinics/2021/e1826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 09/02/2020] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES We compared the autonomic modulation and sleep behavior of eutrophic and overweight patients with chronic obstructive pulmonary disease (COPD). METHODS COPD participants were divided into the overweight and eutrophic groups. Pulmonary function, blood pressure, body composition, autonomic modulation, and the Pittsburgh Sleep Quality Index score were assessed. Participants performed the six-minute walk test for functional assessment. RESULTS Spirometric variables obtained in eutrophic and overweight individuals with COPD showed no statistically different results. We observed that the SDNN index indicated lower overall variability (p=0.003), and root mean square of successive differences between normal heart beats (RMSSD) (p=0.04) indicated lower parasympathetic modulation in the overweight group than observed in the eutrophic group. The indexes of the frequency domain presented lower values of total variability (p<0.01), low frequency bands (p<0.01), and high frequency (p=0.02), suggesting a higher sympathetic modulation and reduced parasympathetic modulation of the overweight group compared to eutrophic group. The overweight group also showed reduced sleep quality than the eutrophic group. CONCLUSION Overweight COPD patients showed lower autonomic modulation and impaired sleep quality, latency, and efficiency as compared eutrophic subjects. These results reinforce the importance of weight control and the acquisition of healthy habits in this population.
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Affiliation(s)
- Cristiano Mostarda
- Laboratorio de Adaptacoes Cardiovasculares ao Exercicio (LACORE), Universidade Federal do Maranhao, Sao Luis, MA, BR
- Programa de Pos-Graduacao em Educacao Fisica, Universidade Federal do Maranhao, Sao Luis, MA, BR
- Centro de Reabilitacao Cardiopulmonar, Hospital Universitario “Presidente Dutra”, Universidade Federal do Maranhao, Sao Luis, MA, BR
| | | | - Ana Lídia Cutrim
- Laboratorio de Adaptacoes Cardiovasculares ao Exercicio (LACORE), Universidade Federal do Maranhao, Sao Luis, MA, BR
- Programa de Pos-Graduacao em Educacao Fisica, Universidade Federal do Maranhao, Sao Luis, MA, BR
| | - Antonio Carlos Silva-Filho
- Laboratorio de Adaptacoes Cardiovasculares ao Exercicio (LACORE), Universidade Federal do Maranhao, Sao Luis, MA, BR
- Programa de Pos-Graduacao em Educacao Fisica, Universidade Federal do Maranhao, Sao Luis, MA, BR
| | - Carlos José Dias
- Laboratorio de Adaptacoes Cardiovasculares ao Exercicio (LACORE), Universidade Federal do Maranhao, Sao Luis, MA, BR
- Centro de Reabilitacao Cardiopulmonar, Hospital Universitario “Presidente Dutra”, Universidade Federal do Maranhao, Sao Luis, MA, BR
| | - Janaina De Oliveira Brito-Monzani
- Laboratorio de Adaptacoes Cardiovasculares ao Exercicio (LACORE), Universidade Federal do Maranhao, Sao Luis, MA, BR
- Programa de Pos-Graduacao em Educacao Fisica, Universidade Federal do Maranhao, Sao Luis, MA, BR
| | - Bruno Rodrigues
- Faculdade de Educacao Fisica, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, BR
- *Corresponding author. E-mail:
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Wan N, Tang X, Ding H, Yan Y, Zhuang Y, Qi C, Chen Q, Xie W, Zhang J, Wang Y, Liang M, Ning W, Cao J. Influence of coexistence of mild OSA on airway mucus hypersecretion in patients with COPD. J Breath Res 2020; 15. [PMID: 33339013 DOI: 10.1088/1752-7163/abd52e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Accepted: 12/17/2020] [Indexed: 11/11/2022]
Abstract
PURPOSE The coexistence of chronic obstructive pulmonary disease (COPD) and obstructive sleep apnea (OSA) can cause multiple system damage, and the main physiological mechanisms are continuous hypoxia and intermittent hypoxia (IH). Airway mucus hypersecretion is an important clinical feature of COPD, which can cause a progressive decline of lung function, acute COPD aggravation, and disease progression. The purpose of our study is to determine the influence of the coexistence of mild OSA on airway mucus hypersecretion. PATIENTS AND METHODS Clinical data and airway epithelial samples were collected. The average fluorescence intensity of MUC5AC and the number of goblet cells were measured through immunofluorescence staining. MUC5AC expression was measured in human bronchial epithelial (HBE) cells exposed to normoxia, IH, particulate matter (PM), and PM+IH using real-time quantitative polymerase chain reaction and western blotting. RESULTS FEV1% pred and FEV1/FVC were higher in patients with COPD-OSA overlap syndrome(OS) than in patients with COPD alone. Patients with OS had less sputum volume than patients with COPD alone.MUC5AC expression and the number of goblet cells in the airway epithelium in the COPD alone group were significantly higher than those in the OS groups. The PM+IH group had lower MUC5AC mRNA and protein expression in HBE cells than the PM group. CONCLUSIONS The coexistence of mild OSA may reduce goblet cell proliferation and MUC5AC expression in the airway epithelium of patients with COPD. Mild IH inhibited PM-induced up-regulation of MUC5AC expression in the mRNA and protein levels in HBE cells.
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Affiliation(s)
- Nansheng Wan
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Xin Tang
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, 300052, CHINA
| | - Hui Ding
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Yuxia Yan
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Yan Zhuang
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Chao Qi
- State Key Laboratory of Medicinal Chemical Biology, Nankai University College of Life Sciences, Tianjin, Tianjin, CHINA
| | - Qianqian Chen
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Wei Xie
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Jing Zhang
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Yan Wang
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Maoli Liang
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, CHINA
| | - Wen Ning
- State Key Laboratory of Medicinal Chemical Biology, Nankai University College of Life Sciences, Tianjin, Tianjin, CHINA
| | - Jie Cao
- Department of Respiratory and Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, 300052, CHINA
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Goulart C, Caruso F, Arêas G, dos Santos P, Camargo P, de Carvalho L, Roscani M, Mendes R, Borghi-Silva A. Impact of chronic obstructive pulmonary disease on linear and nonlinear dynamics of heart rate variability in patients with heart failure. Braz J Med Biol Res 2020; 54:e10084. [PMID: 33263641 PMCID: PMC7695451 DOI: 10.1590/1414-431x202010084] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 09/10/2020] [Indexed: 12/14/2022] Open
Abstract
The objective of this study was to investigate the impact of chronic obstructive pulmonary disease (COPD)-heart failure (HF) coexistence on linear and nonlinear dynamics of heart rate variability (HRV). Forty-one patients (14 with COPD-HF and 27 HF) were enrolled and underwent pulmonary function and echocardiography evaluation to confirm the clinical diagnosis. Heart rate (HR) and R-R intervals (iRR) were collected during active postural maneuver (APM) [supine (10 min) to orthostasis (10 min)], respiratory sinus arrhythmia maneuver (RSA-M) (4 min), and analysis of frequency domain, time domain, and nonlinear HRV. We found expected autonomic response during orthostatic changes with reduction of mean iRR, root mean square of successive differences between heart beats (RMSSD), RR tri index, and high-frequency [HF (nu)] and an increased mean HR, low-frequency [LF (nu)], and LF/HF (nu) compared with supine only in HF patients (P<0.05). Patients with COPD-HF coexistence did not respond to postural change. In addition, in the orthostatic position, higher HF nu and lower LF nu and LF/HF (nu) were observed in COPD-HF compared with HF patients. HF patients showed an opposite response during RSA-M, with increased sympathetic modulation (LF nu) and reduced parasympathetic modulation (HF nu) (P<0.05) compared with COPD-HF patients. COPD-HF directly influenced cardiac autonomic modulation during active postural change and controlled breathing, demonstrating an autonomic imbalance during sympathetic and parasympathetic maneuvers compared with isolated HF.
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Affiliation(s)
- C.L. Goulart
- Laboratório de Fisioterapia Cardiopulmonar, Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - F.R. Caruso
- Laboratório de Fisioterapia Cardiopulmonar, Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - G.P.T. Arêas
- Laboratório de Fisiologia Humana, Departamento de Fisiologia, Universidade Federal do Amazonas, Manaus, AM, Brasil
| | - P.B. dos Santos
- Laboratório de Fisioterapia Cardiopulmonar, Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - P.F. Camargo
- Laboratório de Fisioterapia Cardiopulmonar, Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - L.C.S. de Carvalho
- Centro de Ciência e Tecnologia em Energia e Sustentabilidade, Universidade Federal do Reconcavo da Bahia, Feira de Santana, BA, Brasil
| | - M.G. Roscani
- Departamento de Medicina, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - R.G. Mendes
- Laboratório de Fisioterapia Cardiopulmonar, Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - A. Borghi-Silva
- Laboratório de Fisioterapia Cardiopulmonar, Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil
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Cardiac Autonomic Control in Women with Rheumatoid Arthritis During the Glittre Activities of Daily Living Test. Asian J Sports Med 2020. [DOI: 10.5812/asjsm.101400] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Background: Cardiovascular autonomic dysfunction is one of the most common complications in rheumatoid arthritis (RA), which can be assessed by heart rate variability (HRV) analysis. Because the autonomic nervous system plays an important role in orchestrating the cardiovascular response to stressors, assessing HRV during exercise is critical. The Glittre Activities of Daily Living test (GA-T) was recently proposed as a multitask field test that requires the performance of the upper and lower limbs, both of which are affected in individuals with RA. Objectives: This study was conducted to evaluate autonomic impairment by HRV in women with RA using the GA-T and to correlate these changes with physical functioning and muscle strength. Methods: This cross-sectional study enrolled 20 women (median [interquartile range]: age 55 [47.5 - 68.8] years) with RA (time since diagnosis: 15 [6.50 - 23.5] years) who underwent HRV assessment during GA-T. They also underwent physical functioning assessment through the Health Assessment Questionnaire Disability Index (HAQ-DI) and handgrip strength (HGS) and quadriceps strength (QS) measures. Results: The GA-T time exhibited significant correlations with the following HRV indices: root mean square of successive differences (RMSSD, rs = -0.451, P = 0.041), proportion of iRR differing by > 50 ms from previous intervals (pNN50, rs = -0.697, P = 0.0006), high frequency (HF, rs = -0.693, P = 0.0007), standard deviation of the points perpendicular to the line-of-identity (SD1, rs = -0.476, P = 0.034), and approximate entropy (ApEn, rs = 0.545, P = 0.013). In addition, the HAQ-DI exhibited significant correlations with the following HRV indices: pNN50 (rs = -0.467, P = 0.038) and HF (rs = -0.444, P = 0.049). We did not observe significant correlation between the HRV indices during the GA-T and the muscle strength measures (HGS and QS). Conclusions: In women with RA, the longer the required to perform the GA-T the worse their parasympathetic modulation, sympathetic-vagal imbalance, and complexity of the autonomic nervous system (i.e., increased index of ApEn) were. Physical functioning level was also related to vagal modulation.
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de Carvalho Junior LCS, Trimer R, Zangrando KL, Arêas GPT, Caruso FR, Bonjorno Junior JC, Oliveira CR, Mendes R, Borghi-Silva A. Overlap syndrome: the coexistence of OSA further impairs cardiorespiratory fitness in COPD. Sleep Breath 2020; 24:1451-1462. [PMID: 31898188 DOI: 10.1007/s11325-019-02002-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 12/11/2019] [Accepted: 12/18/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND Cardiorespiratory fitness (CRF) is an important prognostic marker in chronic obstructive pulmonary disease (COPD). Obstructive sleep apnea (OSA) also negatively affects exercise tolerance. However, the impact of their association on CRF has not been evaluated. We hypothesized that patients with overlap syndrome would demonstrate a greater impairment in CRF, particularly those with severe COPD. METHODS Individuals with COPD were recruited. First, subjects underwent clinical and spirometry evaluation. Next, home-based sleep evaluation was performed. Subjects with an apnea-hypopnea index (AHI) < 15 episodes/h were allocated to the COPD group and those with an AHI ≥ 15 episodes/h to the overlap group. On the second visit, subjects underwent a cardiopulmonary exercise test. Subsequently, they were divided into four groups according to the severity of COPD and coexistence of OSA: COPDI/II; overlap I/II; COPDIII/IV; and overlap III/IV. RESULTS Of the 268 subjects screened, 31 were included. The overlap group exhibited higher values for peak carbon dioxide (COPD: 830 [678-1157]; overlap: 1127 [938-1305] mm Hg; p < 0.05), minute ventilation (COPD: 31 [27-45]; overlap: 48 [37-55] L; p < 0.05), and peak systolic blood pressure (COPD: 180 [169-191]; overlap: 220 [203-227] mm Hg; p <; 0.001) and peak diastolic blood pressure COPD: 100 [93-103]; overlap: 110 [96-106] mm Hg; p < 0.001). COPD severity associated with OSA produced a negative impact on exercise time (COPDIII/IV: 487 ± 102; overlap III/IV: 421 ± 94 s), peak oxygen uptake (COPDIII/IV: 12 ± 2; overlap III/IV: 9 ± 1 ml.Kg.min-1 ; p < 0.05) and circulatory power (COPDIII/IV: 2306 ± 439; overlap III/IV: 2162 ± 340 ml/kg/min.mmHg; p < 0.05). CONCLUSION Overlap syndrome causes greater hemodynamic and ventilatory demand at the peak of dynamic exercise. In addition, OSA overlap in individuals with more severe COPD impairs CRF.
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Affiliation(s)
| | - Renata Trimer
- University of Santa Cruz do Sul, Santa Cruz do Sul, Brazil
| | - Katiany Lopes Zangrando
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, Rodovia Washington Luis, KM 235, Monjolinho, São Carlos, SP, 13565-905, Brazil
| | | | - Flávia Rossi Caruso
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, Rodovia Washington Luis, KM 235, Monjolinho, São Carlos, SP, 13565-905, Brazil
| | | | | | - Renata Mendes
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, Rodovia Washington Luis, KM 235, Monjolinho, São Carlos, SP, 13565-905, Brazil
| | - Audrey Borghi-Silva
- Cardiopulmonary Physiotherapy Laboratory, Physiotherapy Department, Federal University of Sao Carlos, Rodovia Washington Luis, KM 235, Monjolinho, São Carlos, SP, 13565-905, Brazil.
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Helmy EM, Sakrana AA, Abdel-Fattah S, Elsaid AR. Diffusion tensor imaging of white matter integrity in relation to smoking index and exacerbations in severe chronic obstructive pulmonary disease. THE EGYPTIAN JOURNAL OF RADIOLOGY AND NUCLEAR MEDICINE 2019. [DOI: 10.1186/s43055-019-0082-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Diffusion tensor imaging (DTI) is a non-invasive MR modality that provides an evaluation of brain tissue microstructure and architecture in vivo. We aimed to assess the diagnostic value of DTI parameters in evaluating cerebral white matter integrity in patients of severe chronic obstructive pulmonary disease (COPD) and correlate these parameters with smoking index (SI) and the number of exacerbations in the last year.
This prospective study included 30 COPD male past smoker patients and 15 age- and sex-matched nonsmoker controls. Staging of COPD, SI and number of exacerbations in the last year were obtained. Routine brain MRI and DTI were done in all subjects. The selected white matter tracts’ fractional anisotropy (FA), and mean diffusivity (MD) were calculated in the region of interest in axial slices.
Results
The mean FA and MD values of all selected white matter tracts showed a high significant difference (p < 0.001) between patients and control group. The correlation between FA, SI and exacerbation frequency was not significant in the majority of white matter tracts (p > 0.05). The correlation between MD, SI and exacerbation frequency was significant for the majority of tracts (p < 0.05).
Conclusion
DTI metrics are valuable non-invasive tools in evaluating the white matter abnormalities in COPD patients. Smoking index and frequency of exacerbations have possible relation to extra-pulmonary cerebral manifestations of COPD.
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Álvarez D, Sánchez-Fernández A, Andrés-Blanco AM, Gutiérrez-Tobal GC, Vaquerizo-Villar F, Barroso-García V, Hornero R, del Campo F. Influence of Chronic Obstructive Pulmonary Disease and Moderate-To-Severe Sleep Apnoea in Overnight Cardiac Autonomic Modulation: Time, Frequency and Non-Linear Analyses. ENTROPY 2019; 21:e21040381. [PMID: 33267095 PMCID: PMC7514865 DOI: 10.3390/e21040381] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 04/02/2019] [Accepted: 04/05/2019] [Indexed: 11/25/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) is one of the most prevalent lung diseases worldwide. COPD patients show major dysfunction in cardiac autonomic modulation due to sustained hypoxaemia, which has been significantly related to higher risk of cardiovascular disease. Obstructive sleep apnoea syndrome (OSAS) is a frequent comorbidity in COPD patients. It has been found that patients suffering from both COPD and OSAS simultaneously, the so-called overlap syndrome, have notably higher morbidity and mortality. Heart rate variability (HRV) has demonstrated to be useful to assess changes in autonomic functioning in different clinical conditions. However, there is still little scientific evidence on the magnitude of changes in cardiovascular dynamics elicited by the combined effect of both respiratory diseases, particularly during sleep, when apnoeic events occur. In this regard, we hypothesised that a non-linear analysis is able to provide further insight into long-term dynamics of overnight cardiovascular modulation. Accordingly, this study is aimed at assessing the usefulness of sample entropy (SampEn) to distinguish changes in overnight pulse rate variability (PRV) recordings among three patient groups while sleeping: COPD, moderate-to-severe OSAS, and overlap syndrome. In order to achieve this goal, a population composed of 297 patients were studied: 22 with COPD alone, 213 showing moderate-to-severe OSAS, and 62 with COPD and moderate-to-severe OSAS simultaneously (COPD+OSAS). Cardiovascular dynamics were analysed using pulse rate (PR) recordings from unattended pulse oximetry carried out at patients’ home. Conventional time- and frequency- domain analyses were performed to characterise sympathetic and parasympathetic activation of the nervous system, while SampEn was applied to quantify long-term changes in irregularity. Our analyses revealed that overnight PRV recordings from COPD+OSAS patients were significantly more irregular (higher SampEn) than those from patients with COPD alone (0.267 [0.210–0.407] vs. 0.212 [0.151–0.267]; p < 0.05) due to recurrent apnoeic events during the night. Similarly, COPD + OSAS patients also showed significantly higher irregularity in PRV during the night than subjects with OSAS alone (0.267 [0.210–0.407] vs. 0.241 [0.189–0.325]; p = 0.05), which suggests that the cumulative effect of both diseases increases disorganization of pulse rate while sleeping. On the other hand, no statistical significant differences were found between COPD and COPD + OSAS patients when traditional frequency bands (LF and HF) were analysed. We conclude that SampEn is able to properly quantify changes in overnight cardiovascular dynamics of patients with overlap syndrome, which could be useful to assess cardiovascular impairment in COPD patients due to the presence of concomitant OSAS.
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Affiliation(s)
- Daniel Álvarez
- Sleep-Ventilation Unit, Pneumology Service, Río Hortega University Hospital, c/ Dulzaina 2, 47012 Valladolid, Spain
- Biomedical Engineering Group, University of Valladolid, Paseo de Belén 15, 47011 Valladolid, Spain
- Correspondence: ; Tel.: +34-983-420400 (ext. 85776)
| | - Ana Sánchez-Fernández
- Sleep-Ventilation Unit, Pneumology Service, Río Hortega University Hospital, c/ Dulzaina 2, 47012 Valladolid, Spain
| | - Ana M. Andrés-Blanco
- Sleep-Ventilation Unit, Pneumology Service, Río Hortega University Hospital, c/ Dulzaina 2, 47012 Valladolid, Spain
| | | | | | - Verónica Barroso-García
- Biomedical Engineering Group, University of Valladolid, Paseo de Belén 15, 47011 Valladolid, Spain
| | - Roberto Hornero
- Biomedical Engineering Group, University of Valladolid, Paseo de Belén 15, 47011 Valladolid, Spain
| | - Félix del Campo
- Sleep-Ventilation Unit, Pneumology Service, Río Hortega University Hospital, c/ Dulzaina 2, 47012 Valladolid, Spain
- Biomedical Engineering Group, University of Valladolid, Paseo de Belén 15, 47011 Valladolid, Spain
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McNicholas WT. Comorbid obstructive sleep apnoea and chronic obstructive pulmonary disease and the risk of cardiovascular disease. J Thorac Dis 2018; 10:S4253-S4261. [PMID: 30687541 DOI: 10.21037/jtd.2018.10.117] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Chronic obstructive pulmonary disease (COPD) and obstructive sleep apnoea (OSA) syndrome are both highly prevalent, affecting at least 10% of the general adult population, and each has been independently associated with an increased risk of cardiovascular disease. The presence of both disorders together, commonly referred to as the overlap syndrome, is also highly prevalent, although various clinical and pathophysiological factors associated with COPD may increase or decrease the likelihood of OSA. Lung hyperinflation reduces the likelihood of obstructive apnoea, whereas right heart failure increases the likelihood as a result of rostral fluid shift causing upper airway narrowing in the supine position while asleep. Furthermore, upper airway inflammation associated with OSA may aggravate lower airway inflammation in COPD. The proposed mechanisms of cardiovascular disease in each disorder are similar and include systemic inflammation, oxidative stress, and sympathetic excitation. Thus, one could expect that the prevalence of co-morbid cardiovascular disease would be higher in the overlap syndrome but, with the exception of pulmonary hypertension, there are few published reports that have explored this aspect in depth. Hypoxia is more pronounced in patients with the overlap syndrome, especially during sleep, which is likely to be the principal factor accounting for the recognised higher prevalence of pulmonary hypertension in these patients. Cardiac sympathetic activity is increased in patients with the overlap syndrome when compared to each disorder alone, but echocardiographic evidence of left ventricular strain is no greater in overlap patients when compared to COPD alone. While survival might be expected to be worse in overlap patients, recent evidence surprisingly indicates that the incremental contribution of lung function to mortality diminishes with increasing severity of OSA. Identification of co-morbid OSA in patients with COPD has practical clinical significance as appropriate positive airway pressure therapy in COPD patients with co-existing OSA is associated with improved morbidity and mortality.
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Affiliation(s)
- Walter T McNicholas
- First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510000, China.,School of Medicine, University College Dublin, Dublin, Ireland
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